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(No Model.) 3 Sheets-Sheet 1 A. A. HATCH. ELECTRICAL SIGNALING APPARATUS No. 403,104. I Patented May 14, 1889.

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A. A. HATCH.

A ELEGTRIGAL SIGNALING APPARATUS. I No. 403,104. Patented May 14, 1889.

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A. A. HATGH. v ELEGTRIGAL SIGNALING APPARATUS. No. 403,104. Patented May 14, 1889.

V i ,U Llljfllzllfdlif' UNITED STATES PATENT OFFICE.

ADIN A. HATCH, OF KANSAS CITY, MISSOURI, ASSIGNOR TO BENJAMIN F. JONES, EDWARD L. MARTIN, AND ALFRED W. JONES, ALL OF SAME PLACE.

ELECTRICAL. SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 403,104, dated May 14, 1889.

Application filed March 22, 1889. Serial No. 304,239, (No model.)

To all whom, it may concern:

Be it known that I, ADIN A. HATCH, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented new and useful Improvements in Electric Signaling Apparatus, of which the following is a specification.

My invention relates to electrical apparatus for the transmission of intelligible messages or for the operation of local signals at different points upon a continuous line or electrical conductor, the several classes of apparatus to which the invention is addressed including telegraph and telephone circuits having a well as the various systems of electric signaling in use in which one or more of a series of visual signals are arranged upon a single main line and operated from a central or main station.

In telegraph systems wherein a series of stations are located at various points upon the line it is well known that in order to call up any one of said stations the operator transmits a series of impulses over the line addressed to that particular point or identified as the call for a particular station, and that these impulses pass through every instrument upon the line, operating the sounders of all in like manner, and requiring every operator to give sufficient attention thereto to determine whether the call is addressed to his own office or elsewhere. Upon telephone-lines, also, where the number of subscribers is not sufficient'to support a central station, or where a number of individuals are upon the same circuit, a call sounded upon one instrument will operate every bell upon the line, the frequent and sometimes almost continuous ringin g of which is a great annoyance to all within hearing. In operating visual or other signals, also, the want has long been felt of simple and practically accurate means whereby any one of a series of such signals arranged at various points upon a single continuous line can be operated individually at any moment without in any manner affecting the others.

It is a further purpose of my invention to provide a simple apparatus adapted to be placed at each one of a series of local stations or points upon a continuous line and adapted to bring into action independent instrumentalities whereby any required result may be produced-such as the operation of a call-bell, a visual signal, or semaphore, or other device, the organization being such that the apparatus will fully respond only to a particular combination of electrical impulses in harmony with which the mechanism is arranged, and will upon any other or different combination respond only partially or not at all, the completed operation resulting in the closing of a local circuit in which the call, signal, or other device is included, or in the operation of other independent instrumentality.

It is my further purpose to provide simple means having automatic action and adapted to be located at a central or controlling station or point upon a continuous line, whereby any given combination of electrical impulses may be automatically transmitted over the line with mechanical accuracy, and whereby, also, an initial series of alternate makes and breaks are sent over the line to throw every individual instrument on the line into operative position in readiness to receive the actuating combination of impulses, to whatever local instrument the same may be addressed, the apparatus selected being then operated by the stated combination to a pointwhere the local circuit is completed and the local callsbell, signal, or other apparatus actuated thereby, every other individual apparatus which may respond in part to the stated combination being withheld or automatically locked against response to any series of electrical impulses save only the particular com-,- bination with which said instrument is identified. V I

It is my purpose to provide a simple mechanical organization capable of being arranged at any point or at any number of points upon or near a continuous electric circuit, said apparatus having a magnet lying in a local circuit operated by a relay in the main line and an armature by which the mechanically-produced movement of a plate or other support carrying a representation of a stated combination of pulsations is by an escapement converted into a series of intermittent movements of different length, the escapement being so organized that upon a predetermined combination of impulses it may complete its forward movement and thereby close an independent circuit within which a call bell, signal, or other apparatus is included, but which upon any diiferent series of impulses will miss the controlling movement of the armature-lever, which will thereby drop, cutting out the escapement-magnet and closing a restoring-circuit, which returns the attachment to its normal or initial position. It is also my purpose to combine with a main line with which a series of such apparatus is connected simple automatic means whereby every escapement throughout the series is set or brought into operative position and held in readiness to respond to a combination of impulses addressed to one individual of the series, the operative combination following being transmitted by automatic and mechani cally-accurate devices.

Referring to the accompanying drawings, Figure 1 is a side elevation of a mechanism embodying my invention. Fig. 2 is a plan View of Fig. 1.. Fig. 3 is a diagram showing the several circuits and illustrating the mode of operation. Fig. at is a detail view of the escapement. Fig. 5 is a similar view showing the lift of the holding-finger and the intermittent swing or turn of the frame or plate permitted by the escapement. Fig. 6 isa vertical cross-section. of the parts shown in Figs. 4 and 5. Fig. 7 is a detail view, partly in plan and partly in section, enlarged, of the frame, showing the form of rack-pins thereon. Fig. 8 is a side elevation showing a modification of the restoring-magnets and of the means for retarding the movement of the frame carrying the keys, by which the combination is worked out.

In the said drawings, the reference-numeral 1 denotes any suitable foundation-piece, of wood or other suitable material, and having any desired shape and size. Upon this foundation are reared supports or uprights 2, connected at their upper extremities by a crossbar or brace, 3, which is preferably of conducting material, like the uprights 2. At a little distance below said cross-bar a seat, 4,

rock-shaft also is a stud, 14c, to which is pivotally connected a link, 15, to the lower end of which is pivotally attached a rod, 16, passing loosely through the end of a soft-iron bar,

17, which is pivoted at its other end upon a support, 18, which may form part of a polarized magnet, 18, or may be a bracket resembling that upon which a common telegraph sounder is mounted, as shown in Fig. 8. The rock-shaft is also provided with a weight, 19, carried by an arm, 20, rising in a nearly vertical line from the shaft, in order that the weight shall exert its minimum force when the shaft is in normal position, as explained hereinafter.

In order to retard the revolution of the rock-shaft and to impart thereto a comparatively slow movement under the force exerted by the weight, I connect the end of the arm 8 to a piston, 21, having a head which loosely fits a cylinder, 22, within which it rises and falls, said cylinder being filled with watch-oil or some other medium not liable to be affected by changes of temperature.

From one side of the curved bar or plate 13 project a series of keys, 23, having substantially the form of double and single staples, arranged with relation to each other in a manner presently to be explained. Depending from the bar or plate is a bracketpiece, 24, curved into parallelism with said plate 13 and supported by legs 25, which are bent at their lower ends to a right angle with the upper portions, in order that the upper surface of the inracketpiece 24: may present no obstructions. The ends 26 of the latter are prolonged somewhat beyond their supports and curved downward, as shown in Figs. 3, 4, and 5.

At a suitable point upon the base or foundation 1 is placed a magnet, 27, of any ordinary construction and provided with a lever, 28, fulcrumed upon a suitable support, 28, and having an armature, 29, said lever being vibrated by the alternate attraction of the magnet and the tension of a spring, 30, connected at one end to a depending arm on the lever and at the other end to a threaded rod, 31, adj ustably mounted in a bracket, 32. A setscrew, 33, tapped through the end of the lever, makes contact with a cushion on the bracket 32 and both limits and adjusts the stroke of the lever in one direction, while a second set-screw, 34, tapped through an arm on the bracket, makes a similar limitation. ad.- justmeut of the stroke in the opposite direction. The construction and arrangement of these parts are substal'itially similar, as shown, to the ordinary telegraphic sounder, which may be adopted as a matter of convenience, though any form of apparatus elfectingalike result will be equally serviceable.

Upon the end of the armaturedcver 28 is mounted a rod, 35, having such length that its end lies directly beneath the rock-shaft 7 and beside the end of the curved plate 13. Upon the free end of said rod is rigidly mounted a finger, 36, projecting laterally toward plate 13 and having its extremity turned downward, as shown in Fig. 6. The

length of this finger is such that it may overlie and engage with the keys 23 in the manner hereinafter explained.

Depending from the free end of the rod 35 is a plate, 37, upon the lower end of which is mounted a chair, 38, lying directly beneath the finger 36. Upon this chair is formed a bifurcated stop-plate, 39, the two branches 40 thereof diverging at an angle having a definite relation to the keys 23. Between these diverging stops is pivotally mounted an escapement-finger, 41, its lower end being forked to straddle the plate 39, as seen in Fig. 6. The pivoted axis of this finger. is surrounded by a coiled spring, 42, whereby the finger, which vibrates in a plane parallel with the swing of the curved plate 13, is normally thrown in a direction opposite to that movement of the plate produced by the weight' The arrangement of the parts is such that the pivotal axis of the escapement-finger lies directly beneath the finger 36, while the pointed end of the former vibrates in substantially the same plane with the hooked or bent extremity of the latter and immediately beneath the same. Projecting laterally from the chair 38 is a bar, 43, extending beneath the curved plate 13, and having attached to its end a block of hard rubber, 44, or other insulating material, upon which is mounted a plate, 45, of conducting metal, said plate being curved upon itself to bring its free end directly over the bracket-piece 24.

Upon the base-plate 1, beneath the swinging plate 13, is attached an angular bracket, 46, upon which is pivotally mounted a circuitclosing arm, 47, the free end of which lies beneath the insulating-support 44 and is normally raised by spring 48, its upward movement being arrested by a stop, 48". Projecting from the angular bracket 46, immediately beneath the circuit-closer 47 is a contactpiece, 49, with which the circuit-closer may have electrical contact when the latter is depressed.

The keys 23, projecting from the curved swinging plate 13, are constructed, as already stated, in the form of single and double staples, the former representing a dot and the latter two dots in succession, or a dash, upon the Morse system. These keys are arranged in any predetermined order with suitable intervals between, whereby they may be made to express any desired combination of long or short electrical impulses. Referring to Fig. 7, in which these parts are shown upon an enlarged scale, it will be noted that each double staple consists of three parallel bars set in the curved plateand having their ends joined by a straight bar, thus forming two inclosed spaces, 50, of equal or substantially equal dimensions. These double staples differ from the single only in the fact that the latter comprise a single inclosed space of the same form and dimensions as one of the spaces 50. Be-

tween each key and the succeeding key, whether single or double, is an open interval,

' one or more keys containing two, three, four, or more inclosed spaces 50, in combination with the single and double keys described.

The apparatus thus far described being that adapted for use at what may be termed the call-stations upon amain line, the

- electrical connections are as follows:

Referring to Fig. 3, the letter L denotes the line-wire or electrical cable, in which a relay, R, is included at each local station or point. This relay closes the circuit of a local battery, L B,in which circuit the escapement-magnet 27 is placed. A short circuit is formed, 110wever, for the local battery by means of a wire, 52, from one pole to the curved contact-plate 45, and a second wire, 53, from the other pole to the swinging plate 13, and thence by the way of the bracket-piece depending therefrom. The magnet 18 lies in an independent circuit form ed by a wire, 54, leading from one pole of abattery, B, to the contact-piece 49 on the angular bracket 46, and a wire, 55, leading from the circuit-closer 47 to the other pole of the battery. I have also shown in the diagram Fig. 3 a signal-circuit formed by a battery,B, in which a call-bell,56, is interposed, this circuit being closed by the contact 9, carried by the arm 8 on the rock-shaft,

and which is at a certain point in the revolution of said shaft brought against the contact 10 upon the cross-beam 3.

Let it now be supposed that by any suitable meanssuch as a circuit-closing key, 57- a series of electrical impulses be sent over the main line. The escapement-magnet 27 being energized at each impulse, the armature-lever is operated and the rod 35 raised, lifting the finger 36, which normally rests upon an arm, 36, extending from the initial key 23 of the series to form a support for the finger. As the latter rises the point of the escapementfinger 41 makes engagement with one of the bars forming the key, and the curved plate 13, being released by the removal of the finger 36, swings under the impulse of the weight 19 as far as the diverging branches of the plate 39 permit, the construction being such that the swing of the escapement-finger will allow the plate to move a distance measured by two of the spaces 50, provided the impulse transmitted by the key is of sufficient length to cover the time occupied by the swingingplate in. moving over the space limited by the escapement-finger. If a single dot or the briefest possible impulse is transmitted, the finger 36 will be raised and immediately dropped, the plate 13 moving in the interior only so far as to engage the bent end of said finger with the adjacent or next succeeding space 50 of the key. If, through accident or by the ignorance of the operator, the next impulse transmitted be a dot, it will be seen by reference to Fig. 7 that the finger 36 will be dropped through the 'open interval 51, whereby the insulating-block M is carried against the circuit-closer 4.7, by which the independent circuit of the magnet 18 is closed, the soft-iron bar 17 is attracted, and the rock-shaft 7 rotated in a retrograde direction until the swinging plate 13 is returned to its original position. At the instant the independent circuit is made in the manner described the curved contact-plate 45 makes engagement with the curved bracket-piece 24 and cuts the escapement-magnet out of circuit, the purpose of so doing being to prevent any pulsations sent over the line from lifting the finger end of the escapement-lever and interfering with the rest or action of the plate 13 to normal position. 011 the other hand, if the operator is perfectly acquainted with the combination of long and short electricalimpulses, in harmony with which the double and single keys 23 and open intervals 51 are arranged, he can so manipulate the key 57 as to work out the complete combination, producing an intermittent or stepby-step movement of the curved swinging plate 13 throughout its normal arc of motion, the final movement closing the signaling-circuit and operating the callbell or other apparatus.

It being understood that upon a main line, L, of any suitable character a series of these instrumentalities may be located at various points, all having the same general organization, but differing from each other in the combination of long and short electrical impulses represented by the series of keys 23 and open intervals 51, it will at once be seen that an operator at the main or home station, knowing the special combination with which each apparatus is identified, may sound the call at any one of the points upon the line in the manner described by simply manipulating the transmitting-key in such manner as to express the combination by which the station called is distinguished from all the others. The remaining instruments upon the line will all respond in part to the series of impulses thus transmitted; but, inasmuch as none of these instruments outside the one to which the combination is addressed are operative upon that particular combination, fingers 36 sooner or later drop through the open intervals 51 and restore the parts to normal position.

It is desirable in all cases where complete and perfect accuracy is required in effecting mechanical results to substitute the unchangeable action of a mechanical element for the varying manipulation of the human hand. I therefore connect the main electrical conductor at the home or main station with an automatic instrumentality by which any given combination of long and short electrical.

pulsations may be transmitted with absolute certainty and accuracy. Inasmuch, also, as it is never possible to know the exact position of the swinging plates 18 with reference to the fingers 36 on the lever-rods, and as it is essential to the proper working out of the combination that these fingers shall rest upon the initial keys representing the respective combinations, I have combined with the autom atic transmitter simple m canswhereby the normal restoration of these parts is effected prior to the transmission of the combination.

The automatic apparatus consists, as shown in Fig. 8, of a disk or cylinder, 58, capable of revolution upon its central axis, and having within its periphery a series of open spaces, 59, intervals 60 being left between said spaces, which express by their relative length the character of the pulsations of any given combination. This cylinder or disk, which is of conducting material, is in electrical connection with the main line, while a brush, 61, resting upon its periphery, is in connection with the battery. At a certain point upon the disk is an interval, 6:2, upon which the brush normally rests, thereby closing the main-line circuit. Following this initial point are a series of similar open spaces, 63, separated by intervals 64, each representing a short pulsation, and following the last space or break is a long interval or make, 65. The disk being turned in the direction indicated by the arrow, the successive short pulsations are sent over the line, by which every one of the several apparatus, without regard to its previous position, is restored to normal position, the long chase or make followed by a short break allowing the swinging plate 13 to recover its position and the escapementlever to drop its rigid fingers in place upon the initial key of the series. In order to set the plate with certainty and accuracy, at least two short makes followed by a long make is essential; but three makes or closures, followed by a long make and thelra short break is absolutely accurate. The cothbination desired is then transmitted by the further rev0- lution of the disk.

I may substitute for the polarized magnet 18, with the soft-iron bar 17 pivoted to one of its poles, the construction shown in Fig. 8, which resembles the escapement magnet and lever in all essential features. The operation, however, is in no respect different from that already described. I may also substitute for the cylinder and piston, with the retarding body of oil, a single electro-magnet, 66, Fig. 8, the circuit of which is made by the rise of the lever 17 or its specified substitute. An armatured lever, 67, is pivotally mounted at one end and connected to a link, 68, pivoted to an arm on the rock-shaft in such manner that the partial revolution of the latter shall vibrate the armature of the lever 67 over the core of the magnet, thereby giving the required retardation and producing an equal movement of the swinging frame. The pur- IIO pose of this arrangement is to put a steady drag or retardation upon the rock-shaft as the plate 13 swings from normal position toward the point where the circuit of the battery B is made, but to avoid any drag during the restoration of the swinging plate. For thls purpose, therefore, the lever 17, which is promptly raised by a spring, 17, after each restoration is effected, carries a contact, as

shown in Fig. 8, by which the circuit of the retarding-magnet is established whenever the circuit of the restoring-magnet 18 is broken; but when said circuit is made and the lever 17 attracted the circuit of the retarding-magnet is at once broken, and the only force the restoring-magn et is obliged to overcome is the actual weight of the arm and the impellingweight 19. By these means I am able to dispense with the use of the oil, which retards and obstructs movements in both directions and requires extra battery-power for the restoring-magnet.

The key-bars upon the swinging plate 13 present angular or wedge-shaped surfaces to the point of the escapement-finger, in order to insure engagement of the latter and prevent obstruction to the action of the escapementl ever caused by the point of the finger strikng the key-bars as the armature of the lever is attracted. I also prefer to round the upper surfaces of these key-bars to enable the bent point of the finger 36 to pass easily over them. While I have shown asimple call-bell as the lnstrumentality operated or brought into act on by completely working out the combination upon any one of the series of apparatus, this device is typical only of a class of devlces or instruments which may be substituted therefor. For example, a series of visual signals may be successfully operated upon this prlnciple, or a telephone-line having a number of individuals upon the same circuit.

What I claim is 1. In an apparatus intermediate between a main electrical conductor and a separate signaling or other instrument, the combination, with a plate or support having single and manifold keys, representing, respectively, one electric pulsation or a series of such pulsations, with intervals between the single and manifold keys, of an armatured escapementlever vibrated by said pulsations and provided with a finger adapted to engage said key-bars and work out the combination represented, said plate having normally a progressive movement proportioned to the character of said pulsations, and said escapementlever having a vibrating finger by which the movements produced by the long pulsations are spaced or equalized, substantially as described.

2. In an apparatus of the type set forth, the combination, with a plate or support having normally a progressive movement, of an armatured escapement-lever having a rigid finger and carrying a vibrating escapeinent-finger, each having alternate engagement with a series of key-bars on said plate arranged to represent a predetermined combination of long and short pulsations. transmitted over a main line upon which a series of apparatus of the type specified is arranged, a restoringmagnet acting upon a lever by which the key-supporting 'plate is restored to normal position, a short circuit for the magnet operating the escapement-lever, and means for closing said circuit-and the circuit of the restoring-magnet automatically, substantially as described.

3. In an apparatus of the type specified, the combination, with a mechanically rotated rock-shaft, of a plate or support suspended therefrom and provided with a series of key- .bars representing electrical pulsations of different length, with open intervals between, an armatured escapementlever having a rigid finger resting upon and a vibrating escapement-finger lying below said key-bars, a restoring-magnet attracting a lever which is linked to a toggle-arm on the rock-shaft, a circuit for said magnet automatically closed by the failure of the lever-fingers to engage the key-bars, and means for retarding the rotary motion of the mechanically-revolved rock-shaft, substantially as described.

4. In an apparatus of the type specified, the combination, with a continuous electrical conductor, of an apparatus comprising a plate or support carrying a series of keybars formed and arranged to represent a predetermined combination of electrical pulsations of different length, means for imparting to said plate a constant progressive movement, an escapement-lever operated by a magnet lying in a local circuit, said lever provided with a rigid finger descending on said keys and a vibrating escapement-finger engaging the latter when the rigid finger is raised, a lever-link connected to the parts supporting said plate, a magnet attracting said lever, an independent local circuit for said magnet, a short circuit for the escapement-magnet, means for automatically making and breaking said circuits, and a separate signaling or other circuit closed by the complete working out of the combination of pulsations, substantially as described.

5. In an apparatus of the type specified, the combination, with a plate or support having a series of keys mounted thereon, each single key consisting of a key-bar bent to the form of a staple inclosing a definite space and each double key inclosing two or more of such spaces, of an escapement-lever having a finger ;the end of which engages said keys successively or drops through open intervals between the same, a magnet energized by said pulsations to vibrate the escapement-lever, a restoring-lever, a magnet operating the latter, and a circuit therefor closed by the drop of said lever caused by the finger passing be tween the keys, substantially as described.

6. In an apparatus of the type specified, the

combination, with a weightimpelled rockshaft supporting a plate upon which are mounted a series of single and double keys, with suitable open intervals between, of an escapement lever, a magnet vibrating the same, a rigid finger and a vibrating escapement-finger, bot-h carried by said escapementlever and alternately engaging the keys, at short circuit for the escapemcnt magnet closed by a contact carried by the escapementlever, a restoringqnagnet attracting a lever linked to an arm 011 the rock-shaft, and a spring-lifted circuit-closing arm arranged beneath the vibrating end of the escapementlever to close the circuit of the restoring-magnet upon the fall of the lever by the passage of its fingers between the keys on the plate, substantially as described.

7. 111 an apparatus of the type specified, the combination, with a swinging plate carrying a series of single and double keys with open intervals between, of an escapenient-lever having a rigid detent-finger and a vibrating spacing or escapement finger, each engaging the keys alternately, a contact, also carried by said lever, adapted to engage a bracket on the plate as the escapement-lever drops by the passage of its rigid finger through one of the intervals between the keys, a short circuit for a magnet operating the escapement lever closed by such drop, a restoring-magnet operating a lever retracting the swinging plate, a circuit for said magnet, a circuit-closing arm normally raised by a spring to break the circuit of the rcstoring-niagn et and depressed by the fall of the escapeinent lever to close the said circuit, and a continuous electrical conductor connected with a relay opening and closing the circuit of the escapement-magnet, substantially as described.

8. In an apparatus of the type specified, the combination, with a swinging plate carried by a weight'impelled rock-shaft and having a series of keys separated by open intervals, of an escapement-lever, a magnet connected with the continuous electrical conductor to operate said lever, a restoring-circuit including a magnet acting upon a lever producing retrograde motion of the rock-shaft, a circuitcloser operated by the fall of the escapementlever and establishing the restoring-circuit, a retarding-magnet lying in a circuit made by the rise of the restoring-lever and broken by its fall, and a pivoted retarding-lever linked at one end to an arm of the rock-shaft and having an armature which is drawn over the core of the retarding-magnet by the rotation of the rock-shaft, substantially as described.

9. In an apparatus of the type specified, the combination, with a continuous electrical. conductor, of a series of local circuits opened and closed by relays in the main line, a series of escapement-magnets lying in the local circuits, escapement levers operated by said magnets and having rigid and vibrating or escapement fingers, a series of vibrating or swinging plates carrying keys of the form described, arranged with open intervals to present a series of different combinations of long and short electric'pulsations, means for vibrating said plates in one direction, a series of restorin g magn ets actu atin glevers which vibrate said plates in the opposite direction, a series of short circuits for the escapement-magnets, a series of independent circuits for the restoring-magnets, means for simultaneously closing said circuits, and a series of separate circuits closed by the complete vibration of said plates, substantially as described.

10. In an apparatus of the type specified, the combination, with a continuous electric circuit, of an escapeinent-magnet lying in a local circuit, a relay, a vibrating plate having keys formed like single and double staples with open intervals between and arranged to represent a predetermined combination of long and short pulsations, a lever vibrated by the escapement-magnet and having a rigid finger engaging and resting upon said keys, said lever carrying a chair having a forked stop-plate in which is pivoted a spring-actuated escapement-finger limited in its vibrations by the forks oi the stop-plate, said finger being arranged under the keys, a weight giving progressive movement to the plate between the rise and fall of the escapement-lever, a restoring-magnet attracting a lever pro ducing motion in the opposite direction, a short circuit for the escapement-magnet, an independent circuit for the restoring-magnet, a contact carried by the chair on the lever and making engagement with a bracket-piece carried by the vibrating plate to close the short circuit, and a circuit-closing arm pivoted beneath the escapement-lever and raised by a spring to break the circuit of the restoring-magnet and thrown down to close said circuit by the descent or fall of the chair and lever, substantially as described.

In testimony whereof I have affixed my signature in presence of two witnesses.

All) IN A. HATCH.

\Vitnesses:

JAMEs L. Nonins, \YINTON Comics.

in Letters Patent No. 403,104.

Correction It is hereby certified that in Letters Patent No. 403,104, granted May 14, 1889, upon the application of Adin A. Batch, of Kansas City, Missouri, for an improvement in Electrical Signaling Apparatus, an error appears in the printed specification requiring the following correction, viz: On page 3, in lines 133-134, the Word interior should read interim; and that the said Letters Patent should be read With this correction therein that the same may conform to the record of the casein the Patent Office.

Signed, countersigned, and sealed this 28th day of May, A. D. 1889.

[SEAL] CYRUS BUSSEY,

Assistant Secretary ofthe Inte Countersigned:

G. E. MITCHELL,

Commissioner of Patents. 

